if you think that having your fingerprints and DNA taken is the worst part about being arrested, then you really need a course in reality.
There have been many cases where people, wrongly accused of a particularly heinous crime (I really hope you don't need some examples) have had there lives ruined. Been forced to move house. Had marriages fail. Denied access to their children. Been unable to find a job. Resulting in more than one suicide.
How do you think your life would fare, if cops took your door down at 5am, dragged you in your underwear into a van, shouting at the top of their voices that you were being arrested on suspicion of sexual offences against a child ?